Apparatus for vibrating fourdrinier wires



March 31, 1931. J. w. VEDDER 1,798,440-

APPARATUS FOR VTBRATING FOURDRINIER WIRES Filed June 27, 1930 2Sheets-Sheet 1 March 31, 1931. VE DE 1,798,440

APPARATUS FOR VIBRATING FOURDRINIER WIRES' Filed June 27, 1950 2Sheets-Sheet 2 Mm 275%): WQI-l-ezzWaefi 6y WWW AW/2 2 M Patented Mar.31, 1931 UNlTED STATES PATENT OFFICE JOHN WARREN 'VEDDER, OF WORCESTER,MASSACHUSETTS, ASSIGNOR TO RICE, BARTON & FALES, INC, OF WORCESTER,MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS APPARATUS FOR VIBRATINGFOURDRINIER WIRES Application filed June 27,

This invention relates to a paper making machine and particularly to theshaking of the Fourdrinier wire.

The principal objects of the invention are to provide an improved meansfor shaking the wire which can be used in any of the ways in which thewire is usually shaken and which Will provide for a greater speed; toprovide a means for shaking which will result in less wear and tear onthe bearings and other parts of the machinery and will involve no extramachinery that would be easily worn out and to provide for shaking thebreast roll, or any other roll in the system, in such a manner that itcan be pneumatically or mechanically cushioned, and said cushion can beadjusted to change the stroke; also to provide a construction which willbe comparatively simple and inexpensive and can be relied upon tooperate eliiciently.

Other objects and advantages of the invention will appear hereinafter.

. Reference is to be had to the accompanying drawings, in which Fig. 1is a side view of'the breast roll and the associated parts of a knowntype of Fourdrinier machine showing a preferred embodiment of thisinvention applied thereto, and

Fig. 2 is a diametrical sectional view through the center of the breastroll journal at one end.

Fourdrinier wires have been vibrated or shaken, in a directiontransverse to the length thereof, at the breast roll or at some otherpoint along the wire or both, but always by mechanical means. The speedof vibration runs up to over two hundred per minute and is sometimesgreater. This vibration comes on the breast roll or other roll journalat the end and is transmitted through the bearings at that end, to thejournal and roll, and to the bearings at the other end or is transmittedthrough a tie frame to the journals. It is ob vious that this is verysevere usage and that the bearings and the mechanical vibrating meanswill break down after a comparatively short life. Repairs are necessaryat frequent intervals. The tying of all these parts up to mechanicalvibrating devices has been uni- 1930. Serial No. 464,379.

versal heretofore with all the attendant disadvantages.

This invention is designed to provide a cushioned vibration and a meansof operation which will permit of material increase in the rate ofvibration up to two or three times the number of vibrations per minuteheretofore attained without the severe wear on the bearings andconnections that have been inherent in this kind of machine heretofore.

This invention is shown as applied to a well-known type of Fourdriniermachine, but the machine is not illustrated in full as the part to bevibrated can be the breast roll itself or a roll at a distance therefromor both, or framing supporting the rolls. It is not intended to limitthis invention to the vibration of any particular roll, so I have showna roll 10, which may be the breast roll or some other roll, over whichthe Fourdrinier Wire 9 passes. This roll is provided with bearings 11 atboth ends for its journals and these hearings are mounted on plates 12which are carried by vertical leaf springs 13 which permit 0f thevibration as is well known. In place of the leaf springs otheroscillating supporting means can be used.

At one end I provide a variable speed motor 15 mounted on a bracket 16on the plate 12, and this is geared down by speed-reducing means of anydesired construction to a shaft 25. This shaft is provided with a crank17, cam or any other equivalent means, for operating a connecting rod 18and a valve rod 19. This valve rod extends across the machinepreferably, and operates two double valves 20, each in a valve casing21, which alternately admits air, steam or liquid on opposite sides ofeach piston 22. The air can be supplied from a tank 23 filled from apump 2% operated by the motor 15 or it can be supplied from an airsupply system.

Each piston 22 is fixed or mounted integrally on a breast roll journal26 and is located in a cylinder 27 provided with a split cylinder headsupported by the bracket 25. Obviously the operation of the motor willcontrol the admission of air pressure first to one side and then to theother of the piston and move the journal back .and forth at a very highrate of speed. It is believed that a speed of perhaps one thousandcomplete vibr; tions per minute would be practical with thisconstruction.

In the form shown the piston 22 is double acting, the pressure beingadmitted first to one side and then to tl other, and the opposite sidealways being vented to the air. single double acting piston can be usedat one end if desired. Also in the form shown there are two of thesedevices, one on each side of the machine and both connected with thejournals of the same roll 10. These, of course can both be made doubleacting, helping ea l1 other at all time and the two valves working atthe opposite onus of the roll in synchronisin as they a e both mountedon the same rod 19. However, each one can be made single act. and allthe driving done first from one end of the roll and then from the otherend, or single double acting piston can be used. Obviously there areother combinations within the skill of the mechanic for securing thisvibration an effective manner.

In the construction shown above, or its equivalent, a high rate ofvibration can be secured without positive mechanical means foraccomplishing it. Also in this construction an air, oil or spring buffercan be employed to dampen the vibrations at each end of the stroke. Thisis shown in the form of a cylinder 30 in which a piston or tail shaft 31on the outer side of the piston 22 constituting the end of the journal26 operates. This is a single-acting piston and there is always a space32 at the end in which there is air. This space can be adjusted by ascrew plug 33 at the end of the cylinder by which the length of thisspace 32 for air can be changed. In this way a buffer or dash pot isprovided for the shaft, one at each end, to lessen the blow which isimparted to the machinery by the vibration of the roll on the shaft 26.Furthermore, the adjustment just mentioned will vary, as may be desired,the elasticity of this buffer and apportion it to the length of thestroke desired. It will be obvious that a spring or hydraulic meanscould be used in place of air in this buffer. In the latter case thestroke is controlled by the escape of oil through an adjustable outlet.

Therefore by the use of air for operating the roll the advantages aresecured of increased speed, reduced wear, and comparatively inexpensiveand durable construction. Steam, oil or water can be used instead ofair.

The speed of the motor is such that it will give a constant number ofreciprocations to the valve rod between limits of fifty and one thousandcomplete cycles to and fro per minute. This will in turn control the airentering on each side of the pistons the same number per minute thusgiving the exact control of the oscillations of the roll that isdesired.

This takes care of the first and second functions of the apparatus.

In order to perform the third function air is compressed at the end ofthe tail shaft 31 to sufiicient pressure to stop the stroke at anypredetermined point and this length of stroke or travel can be alteredby screwing in or out this plug 33.

Although I have illustrated and described only a single form of theinvention I am aware of tne fact that changes can be made therein by anyperson skilled in the art witl out departing from the scope of theinvention as expressed in the claims. Therefore I do not wish to belimited to the exact form shown, but what I do claim is 1. Thecombination in a Fourdrinier machine, of roll for supporting theFourdrinier wire,supports for said roll at both ends of the roll mountedto vibrate, and pneumatic means for vibrating the roll longitudinally.

2. In a Fourdrinier machine, the combination with means for movablysupporting the shaking end of the Fourdrinier wire, of pneumatic meansfor shaking said means.

3. .he combination in a Fourdrinier machine, of a roll for supportingthe Fourdrinier wire, a ournal on which the roll is mounted, bearingsfor said roll at both ends of the roll mounted on springs to vibrate,and pneumatic means for vibrating the journal longitudinally.

4:. In a paper making machine, the combination of a roll for supportinga Fourdrinier wire, a journal on which the roll is supported, and meansfor supporting the end of the journal in a condition to allow it tovibrate, of a piston secured to the journal, a cylinder in which saidpiston is located, and means for intermittently introducing fluid intothe cylinder to force the piston to move longitudinally and take thejournal with it for the purpose of vibrating the roll.

5. In a machine of the character described, the combination with theroll and its journal, of a piston mounted on the journal, a cylinder inwhich said piston is located, valve ports for introducing fluid 011either side of the piston and allowing the exhaust of the air therefrom,a valve for controlling said fluid ports, a shaft, means for operatingthe shaft, and means connected with said shaft for reciprocating thevalve to open and close the ports in proper order to vibrate said pistonand the journal on which it is mounted, for the purpose described.

6. In a Fourdrinier machine, the combination with means for movablysupporting the shaking end of the Fourdrinier wire, of pneumatic meansfor shaking said means, a a single acting piston connected with saidshaking end, a cylinder in which said piston operates and means foradjusting the effective length of the cylinder to control the amplitudeof the vibration.

7. The combination in a Fourdrinier machine, of a roll for supportingthe Fourdrinier wire, a journal on which the roll is mounted, bearingsfor said roll at both ends of the roll mounted on springs to vibrate,pneumatic means for vibrating the journal, a piston on the end of saidjournal, a cylinder in which said piston is located, and an adjustablescrew plug in the end of the cylinder, whereby a fluid can be entrappedin the end of the cylinder beyond the piston constituting a buffer toabsorb the vibration of the supporting parts in which said journal is10- oated, and whereby the amount of fluid so entrapped can be adjustedto control the length of the stroke.

In testimony whereof I have hereunto atfixed my signature.

JOHN WARREN VEDDER.

